Coexistence of inverse and normal magnetocaloric effect in A-site ordered NdBaMn2O6

Zhang, Q.; Guillou, F.; Wahl, A.; Bréard, Y.; Hardy, V.
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p242506
Academic Journal
NdBaMn2O6 exhibits a sequence of two following magnetic transitions: a second-order paramagnetic-ferromagnetic transition at TC=290 K, followed by a first-order ferromagnetic-antiferromagnetic transition around TN=210 K, leading to normal and inverse magnetocaloric effects (MCE), respectively. For ΔB=5 T, the combined |-ΔSMmax| around TC and TN is found to be 2.5 J/kg K and 1.4 J/kgK, respectively. Moreover, the presence of these two -ΔSM peaks spanning over a broad range of temperature leads to a remarkably wide working temperature region, yielding a significant performance in terms of refrigerant efficiency. The present study demonstrates that adjusting the degree of A-site cation ordering in perovskite oxides is an efficient strategy to induce room-temperature MCE.


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